20806453813 has 2 divisors, whose sum is σ = 20806453814. Its totient is φ = 20806453812.

The previous prime is 20806453777. The next prime is 20806453847. The reversal of 20806453813 is 31835460802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20787295684 + 19158129 = 144178^2 + 4377^2 .

It is a cyclic number.

It is not a de Polignac number, because 20806453813 - 2¹⁷ = 20806322741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20806553813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403226906 + 10403226907.

It is an arithmetic number, because the mean of its divisors is an integer number (10403226907).

Almost surely, 2^20806453813 is an apocalyptic number.

It is an amenable number.

20806453813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20806453813 is an equidigital number, since it uses as much as digits as its factorization.

20806453813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 20806453813 in words is "twenty billion, eight hundred six million, four hundred fifty-three thousand, eight hundred thirteen".